Formaldehyde is a well-known carcinogen and the most important component of decoration pollution. In recent years, diatom mud has been enthusiastically sought after because it does not contain toxic pollutants and can purify the air. Diatom mud decomposes The core technology of formaldehyde has also received widespread attention, the most representative of which is Omu. As a patented decomposition material that breaks the bottleneck of the industry, the birth of Omure gives diatom mud the ability to continuously decompose formaldehyde. So what is the principle of Omure to decompose formaldehyde?
1. Formaldehyde can be decomposed in a visible light environment
After the photocatalytic material in Otsu is irradiated by visible light, the electrons (e) on the surface rapidly transition, and at the same time, the surface forms Each hole (h).
The electrons (e) jumped out of the photocatalytic material continuously reduce the oxygen in the air into negative oxygen ions (O2-):
e O2→O2- (1)
p>Negative oxygen ions combine with hydrogen ions in the air to generate hydrogen peroxide molecules and oxygen:
O2- O2- H H →H2O2 O2 (2)
Pass Hydrogen oxide molecules combine again with these negative oxygen ions to generate important hydroxyl radicals, oxygen and hydroxide ions:
H2O2 O2-→HO·O2 OH- (3)
Hydroxide ions and hydrogen ions generate water:
H OH-→H2O (4)
The holes (h) formed on the surface of the photocatalytic material capture the water molecules in the air Electrons (e) form hydroxyl radicals and hydrogen ions:
H H2O→HO·H (5)
Hydroxyl radicals (HO·) are extremely oxidizing, It can non-selectively decompose all volatile aldehydes, benzene series, TVOC and other organic pollutants.
When hydroxyl radicals encounter formaldehyde molecules, they are instantly oxidized into formic acid molecules and water. The formic acid molecules are quickly oxidized by hydroxyl radicals and decomposed into carbon dioxide and water:
HO·HO·HCHO→HCOOH H2O (6)
In this process, Otsu, as a decomposition material, will not be consumed and only plays a catalytic role, thus ensuring the sustainability of diatom mud. Decompose formaldehyde and other harmful gases.
2. The decomposition technology has reached the world's advanced level
The main components of Otsu are: diatomite composite nano-titanium dioxide, diatomite composite nano-zinc oxide and tourmaline. Among them, the diatomite composite nano-titanium dioxide photocatalytic material is a key project of my country's national "Twelfth Five-Year Plan" science and technology support plan, and has passed the scientific and technological achievement appraisal (Building Materials Jianzi [2009] No. 005), testing report and environmental monitoring report. The photocatalytic performance of this composite material is not inferior to the German-made P25 (pure nano-TiO2) product recognized as the most advanced in the world, reaching the international advanced level.
The most advanced and effective method of decomposing harmful gases currently recognized in Japan is nano-titanium dioxide photocatalytic technology. For example, TOTO, Japan's largest building materials manufacturer, launched a new ceramic plate in 2014 that uses nano-titanium dioxide light. Catalyze this advanced technology.
In addition, diatomite composite nano-zinc oxide photocatalytic material can not only decompose harmful gases such as formaldehyde under light conditions, but also play an antibacterial and mildew-proof role.
The combination of multiple materials increases the valence band height of the Otsu decomposition material and reduces its bandgap width, which causes the absorption line of the UV-Vis diffuse reflection spectrum to be red-shifted and increases the visible light absorption efficiency. At the same time, it also improves the conduction efficiency of electrons and greatly reduces the recombination efficiency of photogenerated electron-hole pairs, thus greatly improving the photocatalytic efficiency of the material itself. Not only will the European curtain itself not be consumed during the decomposition process, it is also non-toxic, harmless, safe and environmentally friendly. It can be said that the photocatalytic decomposition technology represented by Omu represents the forefront of the international research and development of diatom mud wall materials.
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